The biggest surprise albums

Surprise albums tend to be pretty successful. Instead of money spent on months of promotion, record labels can promote a new album for just 24 hours before release. In the US, 'Beyoncé' sold one million copies in just 11 days. Drake's surprise mixtape was the highest-selling rap release of 2014, while artists like Frank Ocean and Kendrick Lamar also went number one with surprise albums. Recap the most impressive surprise releases over the years, and click on for some interesting musical insight.